i was curious how it is that topical spiro does not affect dht in the body. I know that we only put it on the head, but their are Ai's and steroids that we put into topicals that affect not only the area we put then on but the whole body?

also if i was to make my own spiro what could i use as a carrier? i heard dermovan but they do not make it any more, then i was told i can use anything. thanks